Joint for wrought-metal tubes



Sept. 22, 1925.

, J. REIMANN Jdm'r FOR WROUGHT METAL TUBES INVENTOR Q4155 FE/M ANN Filedl:S e 1-, 2. 1924 i H Patented Sept. 22, 1925.

UNITED:

Jacque taxman, 0 anm o B M u HeM, ENGLANIJ; AssIaNQR r10. neon,

PATENT OFFICE.

seen t auma 01? BIRMINGHAM; ENGLAND- oIn'r FOR wno eirr-Mmnn TUBES.

Application filediseptember 2, 1924. Serial No. 735,535:

To all whom it may concern:-

Be it known that I, JAo UEs REIMANN, a

subject of the King of Eng-land, residing at Erdington, Birmingham, England, have invented certain new and useful Improvements in Joints for Wrought-Metal Tubes, of which the following is a specification.

This invention relates to wrought metal tubes, including weldless steel tubes and lapwelded tubes, of the kind which are provided with integrally formed external flanges or collars. Where a butt joint is required in two tubes such flanges are adapted to be engaged by loose coupling members upon the tubes, which thereby draw the latter together to make the joint.

In my prior British Patent No. 195,219 I describe a joint in which a flange or collar is formed by folding back externally the end of the tube so that the fold lies closely upon the tube and the end of the folded part forms the shoulder for engagement by the coupling members. This is an effective ar-.

rangement, unless the walls of the tube are unusually thin, and the principal ob ect of the present invention is to provide such 1mprovements as will not only render it su table for such thin walled tubes, but also will possess certain advantages in the case of the thicker walled tubes with which my aforesaid prior patent is mainly concerned.

According to this invention, for the formation of the flange or shoulder I provide an annular liner or sleeve around the tube and fitting closely upon it, and upon this liner I fold back and firmly compress the end of the tube, so that thereby I obtain increased radial thickness of the shoulder, while at the same time retaining all the advantages of my aforesaid prior invention.

Furthermore, I obtain a correspondingly greater radial depth of the abutting ends of the tubes, so that a wider joint ring can be employed,and also, as the bend or fold is of greaterradius, there is less risk of injury to the metal and it is easier to make a fiat end face for the joint ring if this is desired. In some cases the fold and the liner may, if preferred, be brazed, welded, or otherwise united to one another and to the tube as hereunder described.

In the accompanying drawings,

g re 1' Shows a part-sectional elevation of the-end of a tube formed in accordance with this invention, and 1 Figures 2 and 3 each indicate fragmentary alternative constructions.

Like letters indicate like parts throughout the drawings.

In carrying out the invention, the liner A is a ring of rectangular section of a radial thickness as desired, and of an axial length which, in the example Figure 1, is equal to that of the fold required, so that the end of the fold and of the liner may be flush with one another. This liner fits closely around the tube B, and when the fold B is made, the latter is firmly compressed upon the liner. If desired, the end A of the liner in the bend of the fold may have its edges rounded to assist the bend. After the fold is made the adjacent ends A and B of the liner and fold may be trimmed if necessary. Part of the coupling member for the joint is indicated by the broken lines C in Figure 1.

The increased radial thickness thus obtained at the fold is of great advantage in making the joint, as a wider jointing face B is obtained which may be either substantially flat as in Figure 1, or rounded as in Figure 2, owing to the folding action, or it may be formed with a concave face as in Figure 3 so as more eflectually to retain the joint ring or other packing (not shown). Furthermore it is possible to use this form of joint successfully upon thin walled tubes tively, a fillet D of welding metal may be run around the angle to provide an inclined shoulder for the coupling members to bear against. The end C of the counterbore 0 provided in the coupling members C would then be corresponding y inclined- The present invention thus provides a very simple and eflective method of jointing relatively thin Walled tubes, and it avoids all tendency to produce creases in the metal,

(during manufacture or in use) and also risk of fracture of the joint or crushing of the folded parts through stresses set up by internal pressure in the pipes. 7

What I claim as my invention and desire to secure by Letters Patent of the United States is 1. In a Wrought metal tube, the combina tion of a SlBGX B closely surrounding the outside of the tube, a fold at the end of the tube which closely embraces said sleeve and extends somewhat beyond it forming a chanside of the tube, a fold at the end of the tube Which closely embraces said sleeve and is provided With a depressed channel at the bend of the fold shaped to agree with a desired shape of jointing ring, and the adjacent end of said sleeve also provided with depressed channel.

In testlmony whereof I have signed my name to this specificatlon.

. JACQUES REIMANN. 

